What does exactly cause this high rpm misfires? Yes, it really seems to be the DMFW but why does a flywheel cause misfires? Will I have any transmission problems when I disable the misfire detection and still use the OEM DMFW?

What does exactly cause this high rpm misfires? Yes, it really seems to be the DMFW but why does a flywheel cause misfires? Will I have any transmission problems when I disable the misfire detection and still use the OEM DMFW?

Every once in a while one of the well known tuners will go out of their way to make senseless comments and start bs. There are no serious issues from disabling misfire detection period. Its an emissions agorithm which really should just register a code and/or CEL but due to emissions standards BMW also on top of it cuts fuel to the bank which is why this issue ends up being as serious as it does. I still feel the true fix is software based with the misfire algorithm adjusted accordingly for higher hp/rpm noise levels but that fix is certainly much harder to do than it is to change out a flywheel. I just hate the chatter single mass flywheels bring along so until my current clutch setup goes i'll end up running with just misfire detection off as i've done for the last year or more probably with more runs at WOT and beating than most N54s out there, on/off dragstrip and dyno

In any case as i'd already said huge thumbs up to you guys for solving this issue. This should be front page news tbh its not always about peak numbers!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please see http://www.burgertuning.com/emissions_info.html for more information on legal requirements related to use of BMS parts.

Glad to see this phantom misfiring has finally been solved. Now it's living with the constant chatter vs misfire detection off. Personally I'd try raising the idle a bit with INPA to see if the chatter can be toned down.

Glad to see this phantom misfiring has finally been solved. Now it's living with the constant chatter vs misfire detection off. Personally I'd try raising the idle a bit with INPA to see if the chatter can be toned down.

Or use the steel flywheel instead of aluminum. I am installing mine on the 3rd. Unfortunately Spec didn't ship until the 21st. Between then and the 3rd there aren't more than 6 business days since its the holidays. Basically I got screwed by UPS.

Or use the steel flywheel instead of aluminum. I am installing mine on the 3rd. Unfortunately Spec didn't ship until the 21st. Between then and the 3rd there aren't more than 6 business days since its the holidays. Basically I got screwed by UPS.

Nice. I'd appreciate it if you could post a video of the any chatter you get for comparison. Maybe I'll switch mine down the road.

Great. I'd like to see if the DMFW could be improved to the point that it's not an issue for the people who would like to continue running it. Perhaps stronger springs in the final (2nd?) stage to keep it in the working zone at high torque levels rather than against the hard stop.

Every once in a while one of the well known tuners will go out of their way to make senseless comments and start bs. There are no serious issues from disabling misfire detection period. Its an emissions agorithm which really should just register a code and/or CEL but due to emissions standards BMW also on top of it cuts fuel to the bank which is why this issue ends up being as serious as it does. I still feel the true fix is software based with the misfire algorithm adjusted accordingly for higher hp/rpm noise levels but that fix is certainly much harder to do than it is to change out a flywheel. I just hate the chatter single mass flywheels bring along so until my current clutch setup goes i'll end up running with just misfire detection off as i've done for the last year or more probably with more runs at WOT and beating than most N54s out there, on/off dragstrip and dyno

In any case as i'd already said huge thumbs up to you guys for solving this issue. This should be front page news tbh its not always about peak numbers!

I also don't want chatter. Have you done a compression test lately? What fuel/meth are you running?

I think it's been asked but has anyone figured out exactly what the nature of the issue is? It must be loading/unloading the crankshaft lightly at higher power levels causing the misfire detection? Is this from it riding the "bump stop" or the opposite where the floating in the springs causes it?

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please see http://www.burgertuning.com/emissions_info.html for more information on legal requirements related to use of BMS parts.

My thoughts exactly. I will definitely need to get used to the chatter. I can't say that I'm fond of it. But...there was a lot of power left on the table having to short shift. Those last 8-900 rpm is where the car shines.

You get used to just holding in the clutch at stop lights and such. It took me a while, but it doesn't really bother me nearly as much as it used to.

Originally Posted by rudypoochris

I do this already personally, but I know a lot of other people don't.

Holding your clutch in at a light is prolly the worst thing you can do for it...it puts pressure on the fingers and puts added stress to the throwout bearing, which will just wear it out sooner, and it would be a joyous occasion to have to go back into the bellhousing to replace a $60 part because you couldnt deal with some noise.

I dont get what is so bad about the noise. Ive driven many a Porsche 911 and several GTRs that rattled at idle..I think its the most badass thing when it sounds like you got rocks banging around in the transmission...but then again I eat/sleep/breath road racing so whiney gearboxes/clutch rattles dont bother me. neither do squeaky brakes.